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Systematic characterization of transport and thermoelectric properties of a macroscopic graphene fiber

Nano Research 2016年第11期9卷 3536-3546页

作者： Weigang Ma Yingjun Liu Shen Yan Tingting Miao Shaoyi Shi Mincheng Yang Xing Zhang Chao Gao Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing 100084 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Zhejiang University Hangzhou 310027 China Department of Thermal Engineering Tsinghua University Beijing 100084 China Key Laboratory of Process Fluid Filtration and Separation College of Mechanical and Transportation Engineering China University ot Petroleum Beijing Beijing 102249 China

graphene, a two-dimensional material with extraordinary electrical, thermal, and elastic performance, is a potential candidate for future technologies. However, the superior properties of graphene have not yet been realized for graphenederived macroscopic structures such as graphene fibers. In this study, we systematically investigated the temperature （T ）-dependent transport and thermoelectric properties of graphene fiber, including the thermal conductivity （A）, electrical conductivity （o）, and Seebeck coefficient （S）. A increases from 45.8 to 149.7 W·m^-1·K^-1 and then decreases as T increases from 80 to 290 K, indicating the boundary-scattering and three-phonon Umklapp scattering processes. σ increases with T from 7.1 × 10^4 to 1.18 × 10^5 S·m^-1, which can be best explained by the hopping mechanism. S ranges from -3.9 to 0.8 μV·K^-1 and undergoes a sign transition at approximately 100 K.

关键词： macroscopic graphene fiber thermoelectric properties thermal conductivity electrical conductivity Seebeck coefficient

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Chemically doped macroscopic graphene fibers with significantly enhanced thermoelectric properties

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Nano Research 2018年第2期11卷 741-750页

作者： Weigang Ma Yingjun Liu Shen Yan Tingting Miao Shaoyi Shi Zhen Xu Xing Zhang Chao Gao Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Department of Engineering Mechanics Tsinghua University Beijing China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Zhejiang University Hangzhou China Department of Thermal Engineering Tsinghua University Beijing China Key Laboratory of Process Fluid Filtration and Separation College of Mechanical and Transportation Engineering China University of Petroleum-Beijing Beijing China

Flexible wearable electronics, when combined with outstanding thermoelectric properties, are promising candidates for future energy harvesting systems. graphene and its macroscopic assemblies （e.g., graphene-based fibers and films） have thus been the subject of numerous studies because of their extraordinary electrical and mechanical properties. However, these assemblies have not been considered suitable for thermoelectric applications owing to their high intrinsic thermal conductivity. In this study, bromine doping is demonstrated to be an effective method for significantly enhancing the thermoelectric properties of graphene fibers. Doping enhances phonon scattering due to the increased defects and thus decreases the thermal conductivity, while the electrical conductivity and Seebeck coefficient are increased by the Fermi level downshift. As a result, the maximum figure of merit is 2.76 ~ 10~, which is approximately four orders of magnitude larger than that of the undoped fibers throughout the temperature range. Moreover, the room temperature power factor is shown to increase up to 624 btW.m-l.K-2, which is higher than that of any other material solely composed of carbon nanotubes and graphene. The enhanced thermoelectric properties indicate the promising potential for graphene fibers in wearable energy harvesting systems.

关键词： macroscopic graphene fiber bromine doping thermoelectric properties thermal conductivity electrical conductivity Seebeck coefficient

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